Good principles are solid. There is a weightiness, a certainty behind them. What looks right, what feels good — these are superficial things. A great designer defends her work based on principles that last, past one decision, past a thousand, that aren’t carried by whichever way the wind blows.
Doesn’t save your place. For reasons that may have to do with the sheer amount of device memory required, live blogs don’t hold your place — meaning that if your phone goes to its lock screen, or you move to another app and then return to the live blog, you lose your place. That’s fine for users only returning for additional updates — it will always jump you to the top — but if you are in the process of catching up, and either get distracted or interrupted by a new update, it is disruptive to scroll, sometimes a long way, all the way back to find where where you left off.
Conclusion: After a set amount of time, a final update on a live blog will inform readers the blog is shutting down. In the case of a breaking news event, this is often after 24 hours, and provides a final summary of events up to that moment.